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The Retronix R-Car V4H Sparrow Hawk EVTB1 uses 1V8 IO voltage supply for VDDQ18_25_AVB power rail. Update the AVB0 pinmux to reflect the change in IO voltage. Since the VDDQ18_25_AVB power rail is shared, all four AVB0, AVB1, AVB2, TSN0 PFC/GPIO POC[7..4] registers have to be configured the same way. Correct the voltage for EVTA1 boards accordingly by patching the U-Boot control DT in SPL. Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>